Eagle chain riding on top of cog

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Eagle chain riding on top of cog
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Posted: Sep 30, 2019 at 15:06 Quote
I've recently noticed my GX Eagle drivetrain is skipping and popping when I shift into the 42t cog (second to largest). I put the bike in the bike stand and noticed the chain is actually riding on top of the cog like in the picture below.



This problem started after I removed the cassette from the freehub body to grease the pawls. I figured the problem started because the cassette was not in the exact same spot as it was when I removed it so I decided to reset the cable tension, b limit screws (set at sag with the tool) and high and low limit screws.I also made sure the hanger was straight. I originally thought it had too high of cable tension and was getting snagged by the 50t cog during the upshift into the 42t cog but once I put it on the bike stand I noticed that is not the case. The tension is spot on and it shifts great in every other gear. The rear derailleur is practically brand new as I had to replace it due to a crash about 3 months ago.

Has anyone else run into this? The cassette has maybe 800 miles on it. The chain was replace at 600 miles due to being stretched and shifting poorly. The cable and cable housing were also replaced a few months ago. It seems like the Eagle system shifts great when it's brand new but if anything is just a few millimeters out of alignment or just a bit dirty it shifts poorly.

Posted: Nov 15, 2019 at 20:31 Quote
I also have GX ( first sram drivetrain in 10 years) and have had this happen to me a couple times. Not while riding, but in the bike stand. I can't say that I'm very impressed with the way it operates in general. It's ok at best. On the bike stand, it will make strange clunking sounds at times somewhere around the 8th and 9th gear. However, on the trail it doesn't make any unusual sounds and seems to shift just fine. But still pretty clunky. My last drivetrain was a shimano saint 10 speed on my DH bike and it shifted so much better and was dead silent in comparison. So maybe I am not able to answer your questions, but this has been my GX experience. I have considered upgrading to an AXS cassette and chain with XO shifter and derailleur, but I could simply convert everything to shimano XT for half the cost. So that's most likely the route I will take.

Posted: Nov 18, 2019 at 12:43 Quote
brassinne wrote:
I also have GX ( first sram drivetrain in 10 years) and have had this happen to me a couple times. Not while riding, but in the bike stand. I can't say that I'm very impressed with the way it operates in general. It's ok at best. On the bike stand, it will make strange clunking sounds at times somewhere around the 8th and 9th gear. However, on the trail it doesn't make any unusual sounds and seems to shift just fine. But still pretty clunky. My last drivetrain was a shimano saint 10 speed on my DH bike and it shifted so much better and was dead silent in comparison. So maybe I am not able to answer your questions, but this has been my GX experience. I have considered upgrading to an AXS cassette and chain with XO shifter and derailleur, but I could simply convert everything to shimano XT for half the cost. So that's most likely the route I will take.

We are not alone in this. I dug up a big thread on MTBR about the same topic https://forums.mtbr.com/drivetrain-shifters-derailleurs-cranks/sram-eagle-design-flaw-1052658.html

I rode yesterday and I am still getting clunky shifts and am "banging" into the 50t cog on upshifts even after taking the advice in the aforementioned MTBR thread to move the chain one tooth forward on the cassette. It doesn't happen all the time but I'd say one out of every five shifts is clunky. It's only an issue going from 42 to 50 though. Shifting up and down through all other gears is fine.

IMO GX Eagle (can't speak for any of the other levels) shifts great when it's brand new and when it's in the vacuum of a repair stand or design table. Once you put it on a bike and throw it out in the real world it does not perform. I wish Shimano did not come up with their new freehub standard or else I'd have already upgraded to XT 12 speed. I've put maybe 700 miles and one single season on my GX Eagle drivetrain and have already had to replace a chain, a derailleur, and now it looks like the cassette may be going too....

Posted: Nov 18, 2019 at 15:08 Quote
The microspline is also my only real issue at this moment. I'm basically waitting in hopes that Hope releases a microspline freehub. Once that happens, XT it is.

Posted: Nov 19, 2019 at 8:48 Quote
brassinne wrote:
The microspline is also my only real issue at this moment. I'm basically waitting in hopes that Hope releases a microspline freehub. Once that happens, XT it is.

Me too but that still means making the switch to 12 speed XT requires a new freehub body or an entirely new freehub, new cassette, new chain, new derailleur, new shifter, new cranks, and new bottom bracket... Do I hate Sram enough to spend that much money and that much effort to go to 12 speed XT?

Posted: Nov 19, 2019 at 15:45 Quote
provin1327 wrote:
brassinne wrote:
The microspline is also my only real issue at this moment. I'm basically waitting in hopes that Hope releases a microspline freehub. Once that happens, XT it is.

Me too but that still means making the switch to 12 speed XT requires a new freehub body or an entirely new freehub, new cassette, new chain, new derailleur, new shifter, new cranks, and new bottom bracket... Do I hate Sram enough to spend that much money and that much effort to go to 12 speed XT?
I'm not sure why you would have to change the crankset. But, obviously everything else would have to go. The way I see it, I would like to get another set of wheels anyways. So when I do, I'd like to get some hope hubs. I have used them for years and am very happy with their price and performance. The cost of an XO or XX1, AXS cassette alone is roughly the same cost as a XT derailleur, shifter and cassette. So for me, I'd be willing to sell my whole GX drivetrain for a good price and use it to get XT drivetrain components.

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